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Some diuretics can cause low levels of potassium. Potassium is needed to transmit electrical impulses in the heart. A low

A rheumatoid factor (RF) blood test measures the amount of the RF antibody present in the blood. Normally, antibodies are produced

Creatinine and creatinine clearance tests measure the level of the waste product creatinine (say "kree-AT-uh-neen") in your blood

What is pelvic inflammatory disease? Pelvic inflammatory disease (PID) is an infection of your uterus, fallopian tubes, or ovaries

The serum protein electrophoresis (SPEP) test measures specific proteins in the blood to help identify some diseases. Proteins are

A vitamin B12 test measures the amount of vitamin B12 in the blood. The body needs this B vitamin to make blood cells and to

What is intussusception? Intussusception means that one part of the intestine has folded into itself, like a telescope. This can

Coombs tests are done to find certain antibodies that attack red blood cells. Antibodies are proteins made by the immune system

A miscarriage is the loss of a pregnancy during the first 20 weeks. Most happen because the embryo doesn't develop properly

Describes heart failure (congestive heart failure). Discusses common causes like hypertension and coronary artery disease. Has